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Two parallel rails of a railway track insulated from each other and with the ground are connected to a millivoltmeter. The distance between the rails is one metre. A train is travelling with a velocity of 72 ~km / h along the track. The reading of the millivoltmeter (in mV ) is (vertical component of the earth's magnetic induction is 2 10⁻⁵ ~T )

Options

  1. A1.44
  2. B0.72
  3. C0.4
  4. D0.2

Correct answer

C. 0.4

Step-by-step solution

Induced emf, e=B v l where, aligned v & = velocity of train & =72 5 18 & =20 ~m / s & =2 10⁻⁵ 20 1 & =2 10⁻⁵ 20 & =40 10⁻⁵ v & =40 10⁻² mV & =0.4 mV aligned

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